No - the interesting part is seeing the aero impact of windows down quantified for a car with the same basic shape as the Blackflea:

Quote:

Some sources claim that closing windows and using a car's air conditioner will result in higher fuel economy at freeway speeds than leaving the windows open without the air conditioner. FSEC tests showed this in not the case. In repeated evaluation at 65 miles per hour, our test car experienced 11% better fuel efficiency with no A/C and the windows open than using the air conditioner. We also found that closing windows at freeway speeds improved fuel efficiency by 2-3%.

I thought 2.5% was realistic based the size of an open front window compared to the size of an open wheel well. Covering my rear wheel wells improved my FE about 2.8%. "Uncovering" the GTI windows reduced its efficiency by 2.5%.

I realize they're not the same things (one doesn't have a spinning wheel inside it, further stirring up the air). But it's in the ballpark.